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  • 1(current)
Q. No.

Identify the incorrectly matched pair:

PGR Chemical nature
1. Auxins Indole compounds
2. Cytokinin Pyrimidine derivatives
3. ABA Carotenoid derivative
4. Gibberellic acid Terpenes
Subtopic:  Cytokinin |
 85%
Level 1: 80%+
Hints

Identify the incorrectly matched pair:

Scientist PGR discovery
1. Cousins Ethylene
2. Kurosawa Gibberellin
3. Skoog and Miller ABA
4. F. W. Went Auxin
Subtopic:  Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
 83%
Level 1: 80%+
Hints

Kinetin was first discovered from:

 
1. Herring sperm DNA 2. Coconut milk
3. Yeast extract 4. Corn kernels
Subtopic:  Cytokinin |
 81%
Level 1: 80%+
Hints
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Cytokinins do not help in:

1. Production of new leaves
2. Lateral shoot growth
3. Adventitious shoot formation
4. Promotion of apical dominance

Subtopic:  Growth Hormones & Auxin | Cytokinin |
 83%
Level 1: 80%+
Hints

Cytokinins help in delay of leaf senescence because they:

1. Promote new leaves formation
2. Help overcome apical dominance
3. Help in chloroplast formation in leaves
4. Promote nutrient mobilization
Subtopic:  Cytokinin |
 63%
Level 2: 60%+
Hints

Match the following :

A. IAA i. Herring sperm DNA
B. ABA ii. Bolting
C. Ethylene iii. Stomatal closure
D. GA iv. Weed-free lawns
E. Cytokinins v. Ripening of fruits

Options:

A B C D E
1. iv iii v ii i
2. v iii iv ii i
3. iv i v iii ii
4. v iii ii i iv

Subtopic:  Growth Hormones & Auxin | Gibberellin | Cytokinin | Ethylene | Abscisic Acid |
 92%
Level 1: 80%+
Hints
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All the following statements regarding cytokinins are true except:
1. They were discovered as kinetin, a modified form of adenine.
2. Zeatin was isolated from corn-kernels and coconut milk.
3. Kinetin occurs widely in almost all plants.
4. Natural cytokinins are synthesized in region where rapid cell division occurs.
Subtopic:  Cytokinin |
 81%
Level 1: 80%+
Hints
Cytokinins:
I: Help produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious root formation.
II: Help overcome the apical dominance.
III: Promote nutrient mobilisation, which helps in the delay of leaf senescence.
 
1. Only I and II 2. Only I and III
3. Only II and III 4. I, II and III
Subtopic:  Cytokinin |
 83%
Level 1: 80%+
Hints
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